Credit: Light: Science & Applications
a, The dependence of the width and thickness of perovskite single crystal on the width of the hydrophilic window. b, Position distribution of perovskite single crystal in the coordinate system. c, SEM image of CsPbBr3 arrays synthesized on SrTiO3 substrate. d-g, Fluorescence micrograph of MAPbBr3, MAPbBr2Cl, MAPbBrCl2 and MAPbCl3 array, respectively.